Tread portion of an automobile tire



FIG. 1 is a perspective view of a tread portion of an automobile tire showing my new design, it being understood that the tread pattern repeats uniformly throughout the circumference of the tire;

FIG. 2 is a front view thereof, a top view, a bottom view and a rear view being identical with the front view;

FIG. 3 is a left side view thereof, a right side view being identical with the left side view;

FIG. 4 is an enlarged fragmentary front view thereof; and,

FIG. 5 is a cross-sectional view thereof taken along line 5—5 in FIG. 4.

The portion of the article shown in broken lines is for illustrative purpose only and forms no part of the claimed design. 

The ornamental design for a tread portion of an automobile tire, as shown and described. 